4y-39=8y-21

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Solution for 4y-39=8y-21 equation:


Simplifying
4y + -39 = 8y + -21

Reorder the terms:
-39 + 4y = 8y + -21

Reorder the terms:
-39 + 4y = -21 + 8y

Solving
-39 + 4y = -21 + 8y

Solving for variable 'y'.

Move all terms containing y to the left, all other terms to the right.

Add '-8y' to each side of the equation.
-39 + 4y + -8y = -21 + 8y + -8y

Combine like terms: 4y + -8y = -4y
-39 + -4y = -21 + 8y + -8y

Combine like terms: 8y + -8y = 0
-39 + -4y = -21 + 0
-39 + -4y = -21

Add '39' to each side of the equation.
-39 + 39 + -4y = -21 + 39

Combine like terms: -39 + 39 = 0
0 + -4y = -21 + 39
-4y = -21 + 39

Combine like terms: -21 + 39 = 18
-4y = 18

Divide each side by '-4'.
y = -4.5

Simplifying
y = -4.5

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